Carbureter



UNHED STATES Pre'l'lilbl'l OFMQE.

JESSE BALDWIN, OF DETROT, MICHIGAN, ASSIGNOB, T B. C. CASE, OF DETROIT,

lVlICl-IGAN.

CARBURETER.

invasie.

Application led .Tune 7, 1919.

To @ZZ 1li/0m it may cof/recom:

lle it known that l, .lnssn BALDWIN, a citizen of the United States of rmerica, residi at letroit7 in the county of VVvfayne and State of hlichigan, have invented certain new and useful Improvements in Carbureters, of which the following is a specification, reference being had therein to the accompanying drawings.

rllhis invention relates to carbureters and special reference to that type wherein a valvular air and fuel regulatingmember' is actuated by reduction of atmospheric pres-` sure or suction produced within the earbureter by an internal combustion engine served by the carburetor.

My invention will be hereinafter more fully described and then claimed, and reference will new be had to the drawings, wherein- Figure 1 is a vertical longitudinal sectional view of the carbureter;

Fig'. 2 is a horizont-al view showinp)` the relative positions of the carbureter body and lloat chamber, and

Fig. 3 is a side elevation of the carbureter partly broken away and partly in section.

ln the drawing', the reference numeral 1 denotes a cylindrical carburetor body or bowl which has one side thereof provided with an air intake connection 2 devoid of any throttle or butterfly valve. At the opposite side of the carbureter body is a float chamber 3 having a detachable cover il and said float chamber is provided with an offset portion of less depth than the chamber to accommodate a lioat actuated valve 6 movable to and from a fuel intake connection 'l' adapted to admit fuel to the chamber 3 froml a tank or other receptacle (not shown). The valve 6 is carried by the short arm of a .float lever 8 pivoted on a transverse pin 9 within the offset portion of the float chainber 3, and the long arm of said float lever has a conventional form of float 10 within the chamber 3.

The bottom of the carburetor body 1 is provided with a depression or basin 11 having central port or orifice 12 connnunicating` with a tubular body 13, and the lower end of said valve body has a conventional form of stufing` box 1-1 for the adjustable stem of rneedle valve 16, said needle valve being adjustable relative to the port or oriee 12 so that it may be set to regulate Specification of Letters atent.

Patented Apr. 5, 1921.

Serial No. 302,478.

the flow of fuel from the float chamber 3 into the basin 11 of the carbureter body. Communication between the valve body 13 and the float chamber 3 is established by a lateral conduit 17 which also serves to brace the valve 13 relative to the float chamber 3, as best shown in Fig. 1.

The top of the carbureter body 1 is closed by a wall 18 having a central ojr'ieningI 19 and a peripheral seat 20, and mounted on the seat 20 the lower enlarged end 21 of a manifold connection 22 adapted to be connected to the manifold of the internal combustion engine in the usual and well known manner. The lower enlarged end of the manifold connection 22 affords a chamber 23 above the top wall 18 of the carbureter body and the bore of the manifold connection alines with the opening' 19 of the wall 1S.

Slidable in the manifold connection 22 and the opening 19 of the wall 18 is an air and fuel regulating member 24 in the form of a tube that has a peripheral flange 25 eXtending into the chamber 23 and slidable therein. rl`he lower end of the tubular member 21 is in proximity to the basin 11 and is contracted as at 26 to a diameter approximately that of the basin 11e so that said basin may rep` resent 'the bottom of the tubular member but be normally separated therefrom by the annular space between the bottoni of the carbureter body and the lower end of the tubular member.

ln the manifold connection 22 is a throttle or butterfly valve 27 having vits operating shaft 2S provided with a crank 29 at one end thereof and operating` means 30 at the opposite end thereof, said operating means being of conventional form. The crank 29 is pivotally connected by a link 31 to a rod 32 extending into the chamber above the flange 25 therein, and said rod is adapted to limit the upward movement of the member 241 and cause said member to be seated when the throttle 27 is closet. The rod 32 being controlled by the throttle 27 constitutes means for limiting the opening; movement of the valvular member 24, and means for closing said valvular member should there be any tendency of said member to remain open.

The manifold connection 22 has an enlargement 33 providing an angular by-path 311 which communicates with the upper end of the chamber 23 and with the manifold connection 22 in a plane below the throttle 27. Adjustable in the enlargement 33 is a small screw needle valve 35 which extends into the by-path 34 to restrict the passage, or communication between the chamber 23 and the manifold connection 22, and after the valve 35 has been adjusted, it may be held by a conventional form of locking device 36 mounted on the enlargement 33.

The lower enlarged end 2l of the mani fold connection 22 may be connected to the upper end of the carbureter body l by any suitable means at such places indicated 37, and with the manifold connection 22 made separate from the carbureter body it is easy to assemble or install the valvular member 24.

lWhen placing the carbureter in use it is only necessary to adjust the valves 16 and 35 and the degree of adjustment depends upon the type of internal combustion engine served by the carbureter. Assuming that the adjustments have been made for a proper fuel supply to the engine, and that the throttle 27 is slightly open so that an engine may idle, then the air from the ntake connection 2 passing under the lower end of the valvular member 24 lifts suiiicient fuel from the basin ll to serve the engine. As the throttle 27 is opened and the speed of the engine picks up, the partial vacuum or reduction of atmospheric pressure within the chamber 23 elevates the valvular member 24 and permits of a greater quantity of air to pass under said member, over the basin 1l, so that a greater quantity of fuel will be carried upwardly through the valvular member to the engine. The partial vacuum in the chamber 23 is attained through the medium of a by-path 34 and the opening movement of the valvular member 24 is regulated bythe rod 32. When the throttle 27 is closed the rod 32 is lowered and by engaging the flange 25 of the valvular member 24, said member is lowered to reduce the volume of air passing under said member and over ythe fuel basin 11 of the carbureter.

The valvular member 24 constitutes a mixing chamber that is constantly in communication with the supply of fuel, as gasolene within the basin 11 and said basin always contains sufli'cient fuel for starting or engine idling purposes.

It is thought that the operation and utility of my invention will be apparent without further description and while in the drawings there is illustrated a preferred embodiment of my invention, it is to be understood that the structural elements are susceptible to such variations and modifications as fall within the scope of the appended claim.

What l claim is z- A carbureter of the type described comprising a body having an air intake connection and a fuel basin, a throttle in said body, a manifold connection having a lower large end seated on said body, a sleeve-like valvular member slidable in said body and said manifold connection and having a flower contracted end adjacent the bottom of said basin to control the supply of air to said manifold connection, said valvular member cooperating with said manifold connection in providing an annular chamber communieating with the manifold connection above said valvular member and adapted to have a partial vacuum produced therein, a peripheral flange on said valvular member in said annular chamber adapted to raise said valvular member when there is a partial vacuum in said chamber, anda rod extending into said annular chamber and connected to said throttle outside of said body and adapted to engage the flange of said valvular member to lower said valvular member and also limit the forward move ment thereof. Y

in testimony whereof l aflix my signature in the presence of two witnesses.

J ESSE BALDWN. 

